The FBI, 17th Judicial District Drug Task Force, Tennessee Bureau of Investigation and the Marshall County Sheriff's Department are investigating the Nov. 21 shooting death of a Marshall County woman.

The body of Penny Blackwell Coyle, 51, of Verona Caney Road, was found slumped over on the driver's side of her car beside Old Rock Crusher Road that Monday night. Her death is being treated as a homicide.

She probably knew her killer, her stepdaughter said.

"I just think it has to be somebody she knew... somebody she trusted... or she wouldn't have pulled over," said Robin Coyle, 24.

Funeral services for Penny Coyle were at 2 p.m. Saturday in the London Funeral Home Chapel. Burial followed in Short Cemetery.

Robin Coyle and her stepmother spoke for the last time on the telephone about 30 minutes before the shooting when they told each other, '"I love you.'

"We just want for whoever did this to be brought to justice," Robin Coyle said. "We want answers. Anybody who knew her loved her. She was a good person."

A search warrant was executed Nov. 22 as law enforcement agencies continue to investigate the homicide.

"Any and all information given on this case will be checked by an officer of one of the investigating offices," Sheriff Norman Dalton said in a prepared release on Nov. 23.

"Officers are following all leads given and are interviewing several subjects that may have information concerning this case."

Dalton wants people with information about the murder to call Crime Stoppers at 359-4867.